Cosmetic screening emulsion comprising a UV-A screening agent and a UV-B screening agent and its use for skin protection against ultraviolet radiation

Abstract

The invention relates to a cosmetic emulsion screening out UV radiation of wavelengths between 280 and 400 nm comprising in the oil phase, 2,4,6-tris((p-(2'-ethylhexyl-1'-oxycarbonyl)anilino)-1,3,5-triazine and, in the aqueous phase, benzene-1,4-(bis(3-methylidenecamphormethylsulphonic)) acid, partially or completely neutralised, of formula: (* CHEMICAL STRUCTURE *) (I) in which A designates a hydrogen atom, an alkali metal, a N(R)4+ group, R designating a hydrogen atom or a C1-C4 alkyl or hydroxyalkyl radical, or a Mn+/n group where Mn+ is a polyvalent metal cation in which n is equal to 2 or 3 or 4, Mn+ preferably designating Ca2+, Zn2+, Mg2+, Ba2+, Al3+ or Zr4+. The cosmetic screening emulsion according to the invention possesses an improved protection index.

I claim: 
     
       1. An ultraviolet radiation screening cosmetic emulsion which screens out wavelengths between 280 nm and 400 nm which comprises in an oil phase, an effective amount of 2,4,6-tris[p-(2'ethylhexyl-1'-oxycarbonyl)anilino-1,3,5-triazine and, in an aqueous phase, an effective amount of partially or fully neutralized benzene-1,4-acid of the formula: ##STR3## in which A designates a hydrogen atom, an alkali metal, a N(R) 4   +  group, R designating a hydrogen atom or a C 1  -C 4  alkyl or hydroxyalkyl radical, or a M n+  /n group where M n+  is a polyvalent metal cation in which n is 2, 3 or 4. 
     
     
       2. A Cosmetic screening emulsion according to claim 1, which comprises 0.1 to 10% by weight, calculated on the basis of the acid, of benzene-1,4-[bis(3-methylidenecamphormethylsulphonic)]acid, partially or completely neutralised, and 0.1 to 10% by weight of 2,4,6-tris[p-(2'-ethylhexyl-1'-oxycarbonyl)anilino]-1,3,5-triazine. 
     
     
       3. A Cosmetic screening emulsion according to claim 1 which comprises 1 to 6% by weight, calculated on the basis of the acid, of benzene-1,4-[bis(3-methylidenecamphormethylsulphonic)] acid, partially of completely neutralised, and 1 to 6% by weight of 2,4,6-tris[p-(2'-ethylhexyl-1'-oxycarbonyl)-anilino]-1,3,5-triazine. 
     
     
       4. A Cosmetic screening emulsion according to claim 1, wherein the benzene-1,4-[bis(3-methylidenecamphormethylsulphonic)] acid is partially of completely neutralised by an alkali hydroxide, by ammonium hydroxide, by an alkanolamine or by a polyvalent metal salt or hydroxide of valency equal to 2 or 3 or 4, selected from the group consisting of calcium, zinc, magnesium, barium, aluminum and zirconium. 
     
     
       5. A Cosmetic screening emulsion according to claim 1, which is an oil-in-water emulsion the pH of which is between 4 and 9. 
     
     
       6. A cosmetic screening emulsion according to claim 1, wherein the oil phase consists of fatty substances selected from the group consisting of mineral oils, modified vegetable oils, unmodified vegetable oils, modified animal oils, unmodified animal oils, saturated fatty acid esters, unsaturated fatty acid esters, synthetic oils, waxes, silicone oils, and C 12  -C 18  fatty acid and fatty alcohols. 
     
     
       7. A Cosmetic composition according to claim 1, wherein the aqueous phase comprises, in addition to water, a C 1  -C 6  lower monoalcohol or polyalcohol. 
     
     
       8. A Cosmetic screening emulsion according to claim 1, which further contains an emulsifier in an amount of from 1 to 15% of the total weight of the emulsion. 
     
     
       9. A cosmetic screening emulsion according to claim 1, wherein the emulsifier is a member selected from the group consisting of a polyoxyethylenated alkyl (C 8  -C 12 ) phenol containing from 9 to 15 moles of ethylene oxide; a polyoxyethylenated C 12  -C 18  fatty alcohol containing at least 4 moles of ethylene oxide; a polyglycerolated C 10  -C 18  fatty alcohol containing from 4 to 10 moles of glycerol; a polyoxypropylenated C 12  -C 18  fatty alcohol; a polyoxyethylenated and polyglycerolated or monoglycerolated C 12  -C 18  fatty acid ester; a polyoxyethylenated C 12  -C 18  fatty acid ester of sorbitan containing from 10 to 20 moles of ethylene oxide; a polyoxyethylenated C 12  -C 18  fatty acid ester containing at least 2 moles of ethylene oxide; a polyoxyethylenated castor oil containing from 10 to 60 moles of ethylene oxide; a propylene oxide/ethylene oxide copolymer; soybean or egg yolk lecithin; a sucroglycerides; a soap; a fatty alcohol phosphoric ester; an optionally oxyethylenated fatty alcohol sulphate; and a polyoxyethylenated lanolin alcohol, containing at least 4 moles of ethylene oxide. 
     
     
       10. A cosmetic screening composition according to claim 1, which further contains a member selected from the group consisting of thickener, emollient, humectant, surface-active, agent preservative, antifoam, perfume, dye, and pigment. 
     
     
       11. A Cosmetic screening emulsion according to claim 1, which is in the form of a milk, cream or aerosol. 
     
     
       12. A Cosmetic screening emulsion according to claim 1, which further comprises another water-soluble or fat-soluble UV screen selected from the group consisting of coffee oil, a salicylic acid derivative, a cinnamic acid derivative, a p-aminobenzoic acid ester or derivative, an anthranilate, a benzophenone derivative, a benzylidenecamphor derivative, a dibenzoylmethane derivative, a benztriazole derivative, a benzoxazole derivative, a benzimidazole derivative, and an alkyl (C 2  -C 10 ) α-cyano-β,β-diphenylacrylate. 
     
     
       13. Process for protecting the human epidermis against ultraviolet radiation of wavelengths between 280 and 400 nm, which comprises applying to the skin an effective amount of a cosmetic screening emulsion according to claim 1. 
     
     
       14. A Cosmetic emulsion according to claim 1, wherein M +  is Ca 2+ , Zn 2+ , Mg 2+ , Ba 2+ , Al 3+ , or Zr 4+ . 
     
     
       15. A Cosmetic screening emulsion according to claim 12, wherein the benzylidenecamphor derivative is p-methylbenzylidenecamphor.